Could not run skycoind on systems with old libgmp

[isaacvr]

Could not run skycoind on Linux system:

$GOPATH/go run ./cmd/skycoind/skycoind.go

github.com/skycoin/skycoin/src/lib/secp256k1-go

In file included from ./secp256k1/src/impl/../num.h:9,
from ./secp256k1/src/impl/num.h:8,
from ./secp256k1/src/secp256k1.c:5,
from /home/meteor/skycoin/src/lib/secp256k1-go/secp256.go:10:
./secp256k1/src/impl/../num_gmp.h:8:17: error: gmp.h: No such file or directory

System parameters:
Linux TearDrop 2.6.32-358.6.2.el6.i686 #1 SMP Thu May 16 18:12:13 UTC 2013 i686 i686 i386 GNU/Linux
CentOS release 6.4 (Final)